"2 (8-inch square) salt blocks, 2 inches thick 1 tablespoon black peppercorns, coarsely ground ¼ cup coriander seeds, cracked 1 orange, zest finely grated, half juiced, half peeled and sectioned ¼ cup sugar 1 halibut fillet, about 1 ½ pounds, skinned 2 tablespoons extra-virgin olive oil, divided 1 head celery, trimmed, separated into ribs, and thinly sliced diagonally ¼ teaspoon minced garlic ½ teaspoon fleur de sel ½/ teaspoon freshly ground white pepper ¼ cup freshly squeezed orange juice 1 orange, 1 ½/ lemons, or 2 limes, or any combination, cut into wedges"